IC-MA3 Datasheet, PDF (12/19 Pages) IC-Haus GmbH – ANGULAR HALL SENSOR

iC-MA3 ANGULAR HALL SENSOR
WITH SIN/COS OUTPUT, CASCADABLE
MULTI-CHIP CHAIN OPERATION
Rev A2, Page 12/19
CLK
NEN(0)
#0
CLK (P0)
NEN NENO (P3)
NEN(1)
#1
CLK (P0)
NEN NENO (P3)
NEN(2)
#2
CLK (P0)
NEN NENO (P3)
NEN(3)
iC-MA3
P1
P2
GAIN
NERR
iC-MA3
P1
P2
GAIN
NERR
iC-MA3
P1
P2
GAIN
NERR
P1
P2
GAIN
NERR
Figure 6: Multiple sensors in chain operation (example with single-ended output)
In chain operation, multiple sensors connected to a
common signal bus can be readout sequentially, at a
reduced line count (Figure 6).
An asynchronous reset of the chain is possible at any
time, by setting NEN(0) = high. This sets back the bus
outputs of IC #0 to high impedance, and outputs a high
on NENO (pin P3) disabling the subsequent IC’s.
By pulling enable input NEN of IC #0 to low, the first
sensor is activated. With the first rising edge of input
CLK, the bus outputs of IC #0 (P1, P2, GAIN, NERR)
are activated, the bus outputs of IC #1 and IC #2 remain
on high impedance (’High-Z’).
With the falling edge of the second CLK pulse, the bus
outputs IC #0 (P1, P2, GAIN, NERR) become high
impedance and NENO changes from high to low, acti-
vating the subsequent IC #1, which is then active for the
following two CLK pulses. Thus, the outputs of only one
IC are active at a time, and other bus outputs remain
high impedance.
Finally, at the end of the chain, all bus outputs are set
back to high impedance. A new measurement cycle
can be introduced by disabling and re-enabling IC #0
(NEN(0) = high, then followed by a low).
Line signals
Single-ended or differential output signals are available
during chain operation (according to Table 4).
Single-ended output
The measurement is performed single-ended with
VREF as the reference potential. After the first ris-
ing edge of the CLK signal, PSIN is available at P1
and PCOS at P2. After the second rising edge of CLK,
VREF is available at P1 and GAIN at P2. Refer to chap-
ter SENSOR MONITORING, Page 15, for a description
of the GAIN signal.
Differential output
The measurement is performed differentially. After the
first rising edge of the CLK signal, PSIN is available at
pin P1, and PCOS at pin P2. After the second rising
edge of CLK, NSIN is available at pin P1, and NCOS at
pin P2.